Write the equilibrium constant for the following equation: H2O(l) ⇔ H+(aq) + OH- (aq)

Kw = [H⁺] . [OH⁻]

Explanation:

Equilibrium constant for water autoionization equation is called Kw

By the way, the correct form is this:

2H₂O → H₃O⁺ + OH⁻

We do not consider water as a reactant so the correct formula for the constant is:

Kw = [H⁺] . [OH⁻]

Remember that [H⁺] and [OH⁻] must be molar concentrations.

Kw = 1ₓ10⁻¹⁴ → Therefore [H⁺] = [OH⁻] = 1ₓ10⁻⁷ M